Automatic stop device in power looms



Dec. 12, 1961 KYUGORO SAKAMOTO 3,012,589

AUTOMATIC STOP DEVICE IN POWER LOOMS 2 Sheets-Sheet 1 Filed Dec. 24, 1959 @x bx Q w R QR SN $2 Q u IlI I,

KYUGORO SAKAMOTO INVENTOR.

BY 4M Arrows/5 Dec. 12, 1961 KYUGORO SAKAMOTO 3,012,589

AUTOMATIC STOP DEVICE IN POWER LOOMS 2 Sheets-Sheet 2 Filed Dec. 24, 1959 KYUGORo Sax/mm mmvron. M, M V M ATTORNEYS Unite Stats @iiice 3,012,589 AUTOMATIC STOP DEVICE IN POWER LOOMS Kyugoro Sakamoto, 298 Hirosawa-clio, Harnamatsu, Japan Filed Dec. 24, 1959, Ser. No. 861,839 Claims priority, application Japan Jan. 12, 1959 6 Claims. (Cl. 139--376) This invention relates to an automatic stop device in power looms with center forks. A center fork is generally employed in a loom having a large width, and it cannot be as rigid and massive as a side fork, because it is located in the center part of warps, remote from the side frames of the loom, and therefore the frames can not be used as the base of a fork. A principal object of this invention is to provide a device wherein almost no force is applied to a center fork to operate a stop motion mechanism when the filling is broken or exhausted, and the force required to operate the stop motion mechanism is provided by other members, the fork merely serving as a sensing means.

When the filling is replenished, the loom is again started. If the picking of the shuttle is not properly timed, the shuttle will collide with the fork whereby the latter is broken. Another object of this invention is to provide a safety device whereby the loom starts its operation when the timing of all relative members is proper even if the starting handle has been moved.

In the accompanying drawings, FIG. 1 is an elevation view partly in section of the left hand half of a loom, the parts which are not necessary to describe the invention having been omitted;

FIG. 2 is a plan view of an enlarged scale, of the upper right hand portion of the loom of FIG. 1;

FIGS. 3 and 4 are side views respectively taken on lines III-HI and IV-IV of FIG. 2 and on an enlarged scale;

FIG. 5 is a view of the portion shown in FIG. 4 at another instant of operation; and

FIG. 6 is a plan view of rod 54 and rod 55 of ratus of FIG. 1.

Referring to the drawings, the lay 1 of a loom is mounted on the rocking shaft 3 by lay swords 2, and the latter are connected to the cranks of the crank shaft, not shown, in the usual manner. A cam shaft 4 has a sprocket wheel 5 fixed thereto, and the rotation thereof is transmitted by a chain 8 to another sprocket wheel 7 which is fixed to a bevel gear 6 rotatably mounted on the rocking shaft 3, and the bevel gear has a definite rate of rotation relative to the cam shaft.

A vertical spindle 9 is held in brackets 10 and 13 respectively fixed on the lay and the rocking shaft, and a bevel gear 11 is mounted on the upper end of spindle 9, and another bevel gear 12 is rotatably mounted on the lower end of spindle 9. The bevel gear 12 is held in the bracket 13 and meshes with the bevel gear 6. A clutch piece 14 is slidably but not rotatably mounted on the vertical spintile 9 by means of a feather key, and its lower end touches the upper end of the bevel gear 12. There is a single recess on the end of the bevel gear 12 adjacent the clutch piece 14 which cooperates with a single projection on the clutch piece 14, so that the bevel gear 12 and clutch piece 14 are connected when the projection engages in the recess. A spring 15 presses the clutch piece 14 against the bevel gear 12. There is an arm 16 fitted on the bracket 13 with the upper end thereof bent over a flange-14a on the clutch piece, and a recess 14b is provided in the flange so as to allow the clutch piece 14 to slide up past the arm 16 when the recess 14b is aligned with the bent end of the arm 16.

The contacting sides of the single recess in the bevel gearv 12 and the single projection on the clutch piece 14 are sloped so that if the rotation of spindle 9 is prethe appavented, rotation of the bevel gear 12 pushes up the clutch piece 14 up against the spring 15 when the recess 14b is in alignment with the bent arm 16.

A disc 17 is fixed on the vertical spindle 9, and a slit 17a is provided on the circumference of the disc. The function of the disc will be described later on.

A tube 19 is mounted on brackets 23 and 33 on the lay, through which a long rod 18 extends. A bevel gear 22 is firmly secured to the tube at its left end (FIG. 1) and meshes with the bevel gear 11. A cam 20 is eccentrically mounted on the right end of the tube, and the tube 19 opens through the end surface of the cam 20. This cam is provided with a recess 21 on its periphery at a portion of shorter radius, and a sideward projection 24 on a plate 25, which is pivoted on a pin 26 on'a bracket 27 of the lay, rests on the periphery of the disc cam. Forks 28 are fixed on the plate 25 by a cap plate 25b so that they rock up and down with the plate when the cam rotates, the forks being biased downwardly by a weak spring 25a; Spring 27a bears on bracket 27 to prevent overthrow of the forks 28 as they are moved upwardly at a rapid speed.

An arm 29 is pivoted on a pin 30 on the cam 20 and is biased for rotation in a counterclockwise direction'in FIGS. 35 by the influence of a spring 31 on the pin'30 so that the arm 29 bears against a stop 32. When the arm 29 is against the stop 32, it covers the end hole of the tube 19 in the cam. Arm 29 has a beak 29a thereon;

The long bar 18 extending through the tube 19 is connected at its left end with the upper arm of a-bell crank 34which is pivoted on a pin 35 on the lay. The bar 18 is urged to the right by a spring 36 which is inserted between a bracket 37 on thelay and a ring 38 adjustably secured on the bar. When the bar is in the normal position as shown in FIG. 1, the free end 34a of the bell crank is in a position a little higher than a projection 39 on an arm 40, which .arm is fixed to a spindle 41 mounted on a bracket 42 on the machine frame (not shown). But if the rod 18 is moved to the right the bell crank 34 turns a little until a stop ring 43 touches the bracket 37 and the free end 34a is .aligned with the projection 39. The projection 39 is in a position such that when the lay moves to the extreme frontward position, a bunter 68 (which is actually situated behind the projection 39, but for clear understanding, is here shown a little to the side), strikes the free end 3412 thus moving projection 39 if the free 1 end 34a is interposed between the projection 39 and the bunter. When this occurs, the arm 40 is turned through an angle to actuate a conventional series of levers (not shown) connected between upper end 40a of the arm 40 and shipper handle 44 so that shipper handle 44 is freed from its stop position.

A'bell crank 45 is pivoted on a pin 46 on bracket 47 on the lay sword 2. Loosely connected to the end of the upper arm of the bell crank is a rod'49 pivoted to a plate 48. The plate 48 is slidably fitted between parallel ends of a bracket 50 fixed on the lay sword. A vertical slot 51 is provided in the plate 48, and a pin 52 fixed to the bracket 50 passes through the slot. The plate has a jaw 48a which is positioned above the disc plate 17. The :jaw 48:: can pass through the slit 17a in disc plate 17 when they are vertically aligned.

The lower arm of the bell crank 45 is connected-to a bar 54 by an intermediate rod 55, which has stops 55a and 55b mounted thereon. Bar 54 has eyes 54a and 54b thereon, the eye 54b being around rod 55 between stops 55a and 55b, and eye 54a being between stop 55b and a lever 57. A spring 56 is on the rod 55 between a stop 55a and the eye 54a. Shipper handle 44 is for operation of the machine, and the lever 57 is pivoted on the machine frame on a pin58." The lever is hinged to the bar 54 by a pin 59 at its lower'end and is connected tothe 3 shipper handle by pin 60 extending through elongated slot 61 at its upper end.

The shipper handle tends to move in the direction indicated by an arrow S due to its own elasticity if the upper end of the handle is released from a stop position, whereby the machine stops. In this case, the lower end of the lever 57 is moved to a point 62, and the lower end of the bell crank 45 moves from a point 63 to 64.

When the lower end of the bell crank 45 is pulled to the left by the rod 55, the plate 48 slides downwardly if the slit 17a in the disc 17 is aligned with the jaw 48a. Otherwise the spring 56 is temporarily compressed until the disc 17 turns a position in which the jaw 48a can slide into the slit under the influence of the spring 56. When this occurs the spindle 9 is prevented from rotating, and the bevel gear 12 driven by the sprocket wheel through intermediate members turns pushing the clutch piece 14 up against the spring 15.

62a is a point to which the lower end of the lever 57 is brought when the machine is to be turned by hand for trial or inspection. In this case, the lower end of the crank lever is at a point 63a, and the jaw 48a moves only a little way into the slit 17a, whereby the spindle 9 is prevented from rotating. During a trial rotation the forks do not work, since the spindle is not rotating.

A circular cam 65 is fixed on the rod 18, and a small projection 66 is fixed to the left end of the tube 19. The right end of the cam is of such a shape that when the tube rotates the cam is pushed to the left against the action of spring 36 by the projection 66 acting against the surface of the cam 65.

In the normal operation of the loom, the clutch piece 14 is coupled with the bevel gear 12, so that the vertical spindle 9 is turned by the cam shaft 4 through the sprocket wheels 5 and 7 and the chain 8, and the tube 19 with the cam 20 are rotated. As long as there is a filling in the shuttle, the fork 28 is prevented from falling lower than the path P of the filling, so that the rocking plate 25 does not lower its sideward projection 24 sufficiently to touch the bottom part of the recess 21 on the cam 20. However, when the filling is broken or exhausted, the free end of the fork 28 drops until the projection 24 rests on the circumference of the cam 20. When the recess 21 moves under the projection 24, the projection drops into the recess, so that the beak 29a on the arm 29 engages the projection 24. As the cam 20 continues its rotation, the arm 29 is restrained so that it is moved relative to the cam 20 in the direction b on its pivotal pin 30 against the action of spring 31 until the arm 29 uncovers the opening of the tube 19. The rod 18 is then pushed out through the uncovered opening by the spring 36, whereby the bell crank 34 turns a little and the free end 34a moves into alignment with the projection 39. The bunter strikes the end 34a, moving projection 39 during the next motion of the lay, and the loom stops.

When the shuttle is replenished with a full bobbin or the broken thread is knotted and the loom is again set in motion, the vertical spindle 9 beings its rotation and the tube 19 is also rotated. The projection 66 at the left end of the tube pushes the circular cam to the left, so that the arm 29 is returned to its normal position as shown in FIG. 4 by the spring 31. The rod 18 returns to its normal position while the spindle 9 turns about half a revolution.

As the forks 28 are rocked-by the rotation of the disc cam, the spindle is required to rotate in proper timing with the picking motion of the shuttle, otherwise theshuttle would collide with the forks or spring out the shed. The spindle can rotate, as before mentioned, when the jaw 48a is out of the slit 17a and the recess 14b is in alignment with the bent arm 16. This is the time that the timing of all relative parts of the loom is proper. Even if the spring handle is set in the starting position, the vertical spindle does not start its rotation until the clutch piece 14 has turned to this position.

What I claim is:

1. An automatic stop mechanism for power looms with center forks, comprising a tube rotatably mounted on a lay of the loom having a cam eccentrically mounted at one end thereof with said tube opening through said cam, and a bevel gear on the other end thereof, the circumferential surface of the cam being eccentric to the tube and having a recess therein at a shorter radius of the cam, a rod slidably mounted in the tube, one end of which extends to the cam and the other end extending beyond the bevel gear on the tube, said rod being biased toward said cam, a member for operating a stop motion mechanism of the loom to which the other end of said rod is connected, an arm pivotally mounted on the cam and having one end extending adjacent the periphery of said cam and having a beak on said one end, said arm normally covering the hole of the tube in the cam, and a rocking plate having forks thereon pivotally mounted on said loom and having a sideward projection which rests on the circumferential surface of the said cam, whereby the arm on the cam is pivoted relative to the cam to uncover the end of the tube when the sideward projection falls into the bottom of the recess and the beak of the arm engages the projection and the rod is moved to actuate the member operating the stop motion of the loom.

2. An automatic stop mechanism for power looms as claimed in claim 1 in which said cam has a stop thereon and a spring engaging said arm urging said arm in the direction of rotation of said cam against said stop to cover the open end of said tube, said arm being pivoted against the action of said spring when said beak engages said sideward projection.

3. An automatic stop mechanism for power looms with center forks, comprising a tube rotatably mounted on a lay of the loom having a cam eccentrically mounted at one end thereof with said tube opening through said cam, and a bevel gear on the other end thereof, the circumferential surface of the cam being eccentric to the tube and having a recess therein at a shorter radius of the cam, a rod slidably mounted in the tube, one end of which extends to the cam and the other end extending beyond the bevel gear on the tube, said rod being biased toward said cam, a member for operating a stop motion mechanism of the loom to which the other end of said rod is connected, an arm pivotably mounted on the cam and having one end extending adjacent the periphery of said cam and having a beak on said one end, said arm normally covering the hole of the tube in the cam, and a rocking plate having forks thereon pivotally mounted on said loom and having a sideward projection which rests on the circumferential surface of the said cam, whereby the arm on the cam is pivoted relative to the cam to uncover the end of the tube when the sideward projection falls into the bottom of the recess and the beak of the arm engages the projection and the rod is moved to actuate the member operating the stop motion of the loom, and a vertical spindle having a bevel gear at its upper end meshing with said bevel gear on the end of the tube, a means connected to the spindle for rotating the vertical spindle from the cam shaft of the loom, and a means on said bevel gear on said tube and on said rod to bring the end of the rod which has been urged beyond the cam back into the tube when the vertical spindle turns about half a revolution.

4. An automatic stop mechanism for power looms as claimed in claim 3 in which said means on said bevel gear and said rod comprise a further cam on said rod and a projection on said bevel gear engaging with said further cam.

5. An automatic stop mechanism for power looms with center forks as claimed in claim 4, further comprising a clutch piece slidably non-rotatably mounted on said vertical spindle and a bevel gear rotatably mounted on the lower end of said vertical spindle, said clutch piece and said bevel gear having opposed clutch surfaces, a spring urging them into contact with each other, the shape of the clutch surfaces being such that the clutch piece is slid up against the action of the spring when the vertical spindle is held against rotation and the bevel gear is forcibly turned, said clutch piece having a recess on the eriphery thereof, and a bent arm fixed on the rocking shaft of the loom, the Width of the recess being sufficient to permit the clutch piece to pass the bent arm when said recess and said bent arm are aligned.

6. An automatic stop mechanism for power looms with center forks as claimed in claim 5, further comprising a shipper handle on the loom, a further disc fixed on the vertical spindle and having a slit on the periphery thereof, a plate slidably mounted on the lay sword and References Cited in the file of this patent UNITED STATES PATENTS 2,647,545 Budzyna et a1 Aug. 4, 1953 FOREIGN PATENTS 1,009,546 France Mar. 12, 1952 

